Effect of Polyaniline on Electrochemical Properties of the Hydrogen Storage Alloy of La_0.94Mg_0.06Ni_3.49Co_0.73Mn_0.12Al_0.20 AITranslate

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Chinese Library Classification Number:TG139.7[一般工业技术—材料科学与工程]

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La0.94Mg0.06Ni3.49Co0.73Mn0.12Al0.20 hydrogen storage alloy was modified by polyaniline addition and chemical deposition of polyaniline.The results of XRD and SEM show that phase composition of the modified alloy is unchanged by either polyaniline addition or chemical deposition of polyaniline.Coral-like polyaniline was coated on the surface of the modified alloy by polyaniline addition,and the surface is coarser of the modified alloy by chemical deposition of polyaniline.After modification by polyaniline addition,the maximum discharge specific capacity of the alloy electrode is improved from 346.4mA·h/g to 354.8mA·h/g,and its capacity retention rate after 50 cycles increases from 69.5%to 73.0%.After modification by chemical deposition of polyaniline,the maximum discharge specific capacity of the alloy electrode decreases to 307.8mA·h/g,but its capacity retention rate increases to 82.6%.The results of kinetic tests show that the kinetic properties of the alloy are improved after modification by polyaniline addition and decreased with stronger corrosion resistance after modification by chemical deposition of polyaniline.Thus,it is very important to select a suitable polyaniline modification method.